They are rare and usually an indicator of stress. Virtually 99.9% of spiders will live perfectly normal lives with virtually no wobble or a noticable wobble that doesn't hamper the snake in anyway. The snake isn't stressed by the wobble what so ever rather the wobble gets worse when the snake is stressed. This is from my experience mind you. The other 0.1% are usually trainwrecks that have something else wrong with them that worsens the wobble, i.e. A birth defect or another under lying issue. Those ones don't live either way so the chances of that being passed down, if genetic, are slim. The trainwrecks you see on youtube, tumblr, etc. are isolated cases. Most of the time those snakes are actually stressed. I've had a few spiders with varying degrees of wobbles and none have never been as bad as the ones in those videos.
also note, any snake can have a wobble either from birth defect or some sort of trauma or chemical "poisoning". I've seen non spiders wobble and those do a lot worse than spiders.
Another note, there are other morphs that wobble but none are as severe as the spider in terms of wobble intensity. For example, champgnes can wobble but very rarely would you ever notice one actually do the classic wobble.
interesting thing to note about the wobble, you'll never notice it when the snake is moving on the ground. The wobble only manifests when their head is off the ground. There is nothing weong with the spider morph at all and they live perfectly normal healthy lives. Hell my breeder black widow is the most feistiest thing on the planet and his wobble never hampers him. He eats like a truck and breeds like no tomorrow.
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